Colorectal cancer screening and surveillance in patients with inflammatory bowel disease in 2021

Table 4 The Paddington International Virtual ChromoendoScopy ScOre in ulcerative colitis

PICaSSO Mucosal Architecture	PICaSSO Vascular Architecture
0 - No mucosal defect	0 - Vessels without dilatation
A: Continuous/regular crypts	A: Roundish following crypt architecture
B: Crypts not visible (scar)	B: Vessels not visible (scar)
C: Discontinuous and or dilated/elongated crypts	C: Sparse (deep) vessels without dilatation
I - Micro erosion or cryptal abscess	I - Vessels with dilatation
1: Discrete	A: Roundish with dilatation
2: Patchy	B: Crowded or tortuous superficial vessels with dilatation
3: Diffuse
II – Erosions, size < 5 mm	II - Intramucosal bleeding
1: Discrete	A: Roundish with dilatation
2: Patchy	B: Crowded or tortuous superficial vessels with dilatation
3: Diffuse
III – Ulcerations, size > 5 mm	III - Luminal bleeding
1: Discrete	A: Roundish with dilatation
2: Patchy	B: Crowded or tortuous superficial vessels with dilatation
3: Diffuse

PICaSSO: Paddington International Virtual ChromoendoScopy ScOre.